Discovery Of A New Eastward-Propagating Coherent Atmospheric Structure: Equatorial Modon
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About The Author

Masoud is a research scientist at LMD (École polytechnique/ENS Paris/Sorbonne Université) and a postdoctoral researcher at Cologne University.

                       

Discovery Of A New Eastward-Propagating Coherent Atmospheric Structure: Equatorial Modon

Recently steady, long-living, slowly eastward-moving large-scale coherent twin cyclones, so-called “equatorial modons,” have been reported by Rostami & Zeitlin in a moist-convective rotating shallow water model . This improved model has already applied to a study of the stability of jets and vortices on Earth and other planets . Some planetary-scale systems that propagate eastward are the Kelvin waves and the Madden–Julian Oscillation (MJO) . The former propagate too fast (about 50 m/s), while the latter has...

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Simulation Of Tropical Cyclones In A Simple Way

It is known that moist convection is a key factor for the development of tropical weather systems, severe weather, thunderstorms, hailstorms, and tornadoes. It acts as a turbo engine for the cyclones. Some questions that come to mind in this context are: how do diabatic phenomena affect the dynamics of large-scale Earth and planetary flows? How can we construct an idealized model to represent the hydrological cycle of evaporation and precipitation, as well as the intense effects of latent heat...

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Mars’ Polar Vortex

A surprising radial distribution of potential vorticity (PV) of Martian atmosphere represents a minimum PV value at the winter pole, which is surrounded by an annular circumpolar vortex with high PV. The potential vorticity (PV) is the absolute circulation of an air parcel in a fluid motion that is enclosed between two isentropic surfaces. PV plays a major role in operational weather diagnosis, weather forecasts, and research. Credit: Masoud Rostami According to the instability rules, the PV...

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Saturn’s North Polar Hexagon

The dynamical nature of the hexagonal cloud pattern on Saturn's north pole was unexplained by planetary science for ≈ 35 years since its first observation. Nothing like the hexagon has ever been seen on any other planet. The lack of a similar pattern on the south pole has been another unsolved problem. Early visible observations of the Voyager 1&2 fly-by of Saturn in 1980-1981 revealed the hexagonal cloud pattern of Saturn's north pole at about 77 ◦N planetographic latitude. This...

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